The Allegheny and Monongahela Rivers meet at Pittsburgh to form the Ohio River. The Allegheny, flowing south through forests and small towns, runs at an average flow of 340 cfs (cubic feet per second) and has a low silt load, 250 mg/L. The Monongahela, on the other hand, flows north at a flow of 460 cfs through old steel towns and poor farm country, carrying a silt load of 1500 mg/L. Assuming complete mixing and steady-state conditions (a) What is the flow rate in the Ohio River? (b) What is the silt concentration in the Ohio River?

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.